/**
 * Dev seed — заполняет store фейковыми контактами и сообщениями для UI-теста.
 *
 * Запускается один раз при монтировании layout'а если store пустой
 * (useDevSeed). Реальные контакты через WS/HTTP приходят позже —
 * `upsertContact` перезаписывает mock'и по address'у.
 *
 * Цели seed'а:
 *   1. Показать все три типа чатов (direct / group / channel) с разным
 *      поведением sender-meta.
 *   2. Наполнить список чатов до скролла (15+ контактов).
 *   3. В каждом чате — ≥15 сообщений для скролла в chat view.
 *   4. Продемонстрировать "staircase" (run'ы одного отправителя
 *      внутри 1h-окна) и переключения между отправителями.
 */
import { useEffect } from 'react';
import { useStore } from './store';
import type { Contact, Message } from './types';

// ─── Детерминированные «pubkey» (64 hex символа) ───────────────────
function fakeHex(seed: number): string {
  let h = '';
  let x = seed;
  for (let i = 0; i < 32; i++) {
    x = (x * 1103515245 + 12345) & 0xffffffff;
    h += (x & 0xff).toString(16).padStart(2, '0');
  }
  return h;
}

const now = () => Math.floor(Date.now() / 1000);
const MINE = fakeHex(9999);

// ─── Контакты ──────────────────────────────────────────────────────
// 16 штук: 5 DM + 6 групп + 5 каналов. Поле `addedAt` задаёт порядок в
// списке когда нет messages — ordering-fallback.

const mockContacts: Contact[] = [
  // ── DM ──────────────────────────────────────────────────────────
  { address: fakeHex(1001), x25519Pub: fakeHex(2001),
    username: 'jordan', addedAt: Date.now() - 60 * 60 * 1_000, kind: 'direct' },
  { address: fakeHex(1002), x25519Pub: fakeHex(2002),
    alias: 'Myles Wagner', addedAt: Date.now() - 2 * 60 * 60 * 1_000, kind: 'direct' },
  { address: fakeHex(1010), x25519Pub: fakeHex(2010),
    username: 'sarah_k', addedAt: Date.now() - 3 * 60 * 60 * 1_000, kind: 'direct',
    unread: 2 },
  { address: fakeHex(1011), x25519Pub: fakeHex(2011),
    alias: 'Mom',       addedAt: Date.now() - 5 * 60 * 60 * 1_000, kind: 'direct' },
  { address: fakeHex(1012), x25519Pub: fakeHex(2012),
    username: 'alex_dev', addedAt: Date.now() - 6 * 60 * 60 * 1_000, kind: 'direct' },

  // ── Groups ─────────────────────────────────────────────────────
  { address: fakeHex(1003), x25519Pub: fakeHex(2003),
    alias: 'Tahoe weekend 🌲', addedAt: Date.now() - 4 * 60 * 60 * 1_000, kind: 'group' },
  { address: fakeHex(1004), x25519Pub: fakeHex(2004),
    alias: 'Knicks tickets', addedAt: Date.now() - 5 * 60 * 60 * 1_000, kind: 'group',
    unread: 3 },
  { address: fakeHex(1020), x25519Pub: fakeHex(2020),
    alias: 'Family',   addedAt: Date.now() - 8 * 60 * 60 * 1_000, kind: 'group' },
  { address: fakeHex(1021), x25519Pub: fakeHex(2021),
    alias: 'Work eng',  addedAt: Date.now() - 12 * 60 * 60 * 1_000, kind: 'group',
    unread: 7 },
  { address: fakeHex(1022), x25519Pub: fakeHex(2022),
    alias: 'Book club', addedAt: Date.now() - 24 * 60 * 60 * 1_000, kind: 'group' },
  { address: fakeHex(1023), x25519Pub: fakeHex(2023),
    alias: 'Tuesday D&D 🎲', addedAt: Date.now() - 30 * 60 * 60 * 1_000, kind: 'group' },

  // (Channel seeds removed in v2.0.0 — channels replaced by the social feed.)
];

// ─── Генератор сообщений ───────────────────────────────────────────

// Альт-отправители для group-чатов — нужны только как идентификатор `from`.
const P_TYRA  = fakeHex(3001);
const P_MYLES = fakeHex(3002);
const P_NATE  = fakeHex(3003);
const P_TYLER = fakeHex(3004);
const P_MOM   = fakeHex(3005);
const P_DAD   = fakeHex(3006);
const P_SIS   = fakeHex(3007);
const P_LEAD  = fakeHex(3008);
const P_PM    = fakeHex(3009);
const P_QA    = fakeHex(3010);
const P_DESIGN= fakeHex(3011);
const P_ANNA  = fakeHex(3012);
const P_DM_PEER = fakeHex(3013);

type Msg = Omit<Message, 'id'>;

function list(prefix: string, list: Msg[]): Message[] {
  return list.map((m, i) => ({ ...m, id: `${prefix}_${i}` }));
}

function mockMessagesFor(contact: Contact): Message[] {
  const peer = contact.x25519Pub;

  // ── DM: @jordan ────────────────────────────────────────────────
  if (contact.username === 'jordan') {
    // Важно: id'ы сообщений используются в replyTo.id, поэтому
    // указываем их явно где нужно сшить thread.
    const msgs: Message[] = list('jordan', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 22, text: 'Hey, have a sec later today?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 21, read: true, text: 'yep around 4pm' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20, text: 'cool, coffee at the corner spot?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 19, read: true, text: 'works' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 4,  text: 'just parked 🚗' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 4,  text: 'see you in 5' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 3,  read: true, text: "that was a great catchup" },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 3,  text: "totally — thanks for the book rec" },
      { from: peer, mine: false, timestamp: now() - 60 * 40, text: 'Hey Jordan - Got tickets to the Knicks game tomorrow, let me know if you want to come!' },
      { from: peer, mine: false, timestamp: now() - 60 * 39, text: "we've got floor seats 🔥" },
      { from: peer, mine: false, timestamp: now() - 60 * 38, text: "starts at 7, pregame at the bar across the street" },
      { from: MINE, mine: true,  timestamp: now() - 60 * 14, read: true, edited: true, text: 'Ah sadly I already have plans' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 13, read: true, text: 'maybe next time?' },
      { from: peer, mine: false, timestamp: now() - 60 * 5,  text: "no worries — enjoy whatever you're up to" },
      { from: peer, mine: false, timestamp: now() - 60 * 2,  text: "wish you could make it tho 🏀" },
    ]);
    // Пришьём reply: MINE-сообщение "Ah sadly…" отвечает на "Hey Jordan - Got tickets…"
    const target = msgs.find(m => m.text.startsWith('Hey Jordan - Got tickets'));
    const mine   = msgs.find(m => m.text === 'Ah sadly I already have plans');
    if (target && mine) {
      mine.replyTo = {
        id:     target.id,
        author: '@jordan',
        text:   target.text,
      };
    }
    return msgs;
  }

  // ── DM: Myles Wagner ───────────────────────────────────────────
  if (contact.alias === 'Myles Wagner') {
    return list('myles', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 30, text: 'saw the draft, left a bunch of comments' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 29, read: true, text: 'thx, going through them now' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 29, text: 'no rush — tomorrow is fine' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 5, text: 'lunch today?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 4, read: true, text: "can't, stuck in reviews" },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 4, read: true, text: 'tomorrow?' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 4, text: '✅ tomorrow' },
      {
        from: peer, mine: false, timestamp: now() - 60 * 60 * 2, text: '',
        attachment: {
          kind: 'voice',
          uri:  'voice-demo://myles-1',
          duration: 17,
        },
      },
      { from: peer, mine: false, timestamp: now() - 60 * 25, text: 'the dchain repo finally built for me' },
      { from: peer, mine: false, timestamp: now() - 60 * 25, text: 'docker weirdness was the issue' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 21, read: true, text: "nice, told you the WSL path would do it" },
      { from: peer, mine: false, timestamp: now() - 60 * 20, text: 'So good!' },
    ]);
  }

  // ── DM: @sarah_k (с unread=2) ──────────────────────────────────
  if (contact.username === 'sarah_k') {
    return list('sarah', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 30, text: "hey! been a while" },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 28, read: true, text: 'yeah, finally surfaced after the launch crunch' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 27, text: 'how did it go?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 27, read: true, text: "pretty well actually 🙏" },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 2, text: 'btw drinks on friday?' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 2, text: 'that new wine bar' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 2, text: 'around 7 if you can make it' },
    ]);
  }

  // ── DM: Mom ────────────────────────────────────────────────────
  if (contact.alias === 'Mom') {
    return list('mom', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 48, text: 'Did you see the photos from the trip?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 47, read: true, text: 'not yet, send them again?' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 47, text: 'ok' },
      {
        from: peer, mine: false, timestamp: now() - 60 * 60 * 46, text: '',
        attachment: {
          kind:   'image',
          uri:    'https://images.unsplash.com/photo-1506905925346-21bda4d32df4?w=800',
          width:  800, height: 533, mime: 'image/jpeg',
        },
      },
      {
        from: peer, mine: false, timestamp: now() - 60 * 60 * 46, text: '',
        attachment: {
          kind:   'image',
          uri:    'https://images.unsplash.com/photo-1519681393784-d120267933ba?w=800',
          width:  800, height: 533, mime: 'image/jpeg',
        },
      },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 30, read: true, text: 'wow, grandma looks great' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 30, text: 'she asked about you!' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 7, text: 'call later?' },
    ]);
  }

  // ── DM: @alex_dev ──────────────────────────────────────────────
  if (contact.username === 'alex_dev') {
    return list('alex', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 12, text: 'did you try the new WASM build?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 11, read: true, text: 'yeah, loader error on start' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 11, text: 'path encoding issue again?' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 10, read: true, text: 'probably, checking now' },
      { from: MINE, mine: true,  timestamp: now() - 60 * 60 * 8, read: true, text: 'yep, was the trailing slash' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 8, text: 'classic 😅' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 7, text: 'PR for that incoming tomorrow' },
    ]);
  }

  // ── Group: Tahoe weekend 🌲 ────────────────────────────────────
  if (contact.alias === 'Tahoe weekend 🌲') {
    const msgs: Message[] = list('tahoe', [
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 60 * 50, text: "who's in for Tahoe this weekend?" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 60 * 49, text: "me!" },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 48, read: true, text: "count me in" },
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 60 * 48, text: "woohoo 🎉" },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 47, text: "planning friday night → sunday evening yeah?" },
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 60 * 46, text: "yep, maybe leave friday after lunch" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 60 * 30, text: "I made this itinerary with Grok, what do you think?" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 60 * 30, text: "Day 1: Eagle Falls hike" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 60 * 30, text: "Day 2: Emerald bay kayak" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 60 * 30, text: "Day 3: lazy breakfast then drive back" },
      {
        from: P_MYLES, mine: false, timestamp: now() - 60 * 60 * 30, text: '',
        attachment: {
          kind: 'file',
          uri:  'https://example.com/Lake_Tahoe_Itinerary.pdf',
          name: 'Lake_Tahoe_Itinerary.pdf',
          size: 97_280, // ~95 KB
          mime: 'application/pdf',
        },
      },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 24, read: true, edited: true, text: "Love it — Eagle falls looks insane" },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 24, text: "Eagle falls was stunning last year!" },
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 31, text: "who's excited for Tahoe this weekend?" },
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 30, text: "I've been checking the forecast — sun all weekend 🌞" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 22, text: "I made this itinerary with Grok, what do you think?" },
      { from: P_MYLES, mine: false, timestamp: now() - 60 * 21, text: "Day 1 we can hit Eagle Falls" },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 14, read: true, edited: true, text: "Love it — Eagle falls looks insane" },
      {
        from: P_TYRA, mine: false, timestamp: now() - 60 * 3, text: 'pic from my last trip 😍',
        attachment: {
          kind:   'image',
          uri:    'https://images.unsplash.com/photo-1505245208761-ba872912fac0?w=800',
          width:  800,
          height: 1000,
          mime:   'image/jpeg',
        },
      },
    ]);
    // Thread: mine "Love it — Eagle falls looks insane" — ответ на
    // Myles'овский itinerary-PDF. Берём ПЕРВЫЙ match "Day 1 we can hit
    // Eagle Falls" и пришиваем его к первому mine-bubble'у.
    const target = msgs.find(m => m.text === 'Day 1 we can hit Eagle Falls');
    const reply  = msgs.find(m => m.text === 'Love it — Eagle falls looks insane' && m.mine);
    if (target && reply) {
      reply.replyTo = {
        id:     target.id,
        author: 'Myles Wagner',
        text:   target.text,
      };
    }
    return msgs;
  }

  // ── Group: Knicks tickets ──────────────────────────────────────
  if (contact.alias === 'Knicks tickets') {
    return list('knicks', [
      { from: P_NATE,  mine: false, timestamp: now() - 60 * 60 * 20, text: "quick group update — got 5 tickets for thursday" },
      { from: P_TYLER, mine: false, timestamp: now() - 60 * 60 * 19, text: 'wow nice' },
      { from: P_TYLER, mine: false, timestamp: now() - 60 * 60 * 19, text: 'where are we seated?' },
      { from: P_NATE,  mine: false, timestamp: now() - 60 * 60 * 19, text: 'section 102, row 12' },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 18, read: true, text: 'thats a great spot' },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 18, text: "can someone venmo nate 🙏" },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 17, read: true, text: 'sending now' },
      { from: P_NATE,  mine: false, timestamp: now() - 60 * 32, text: "Ok who's in for tomorrow's game?" },
      { from: P_NATE,  mine: false, timestamp: now() - 60 * 31, text: 'Got 2 extra tickets, first-come-first-served' },
      { from: P_TYLER, mine: false, timestamp: now() - 60 * 27, text: "I'm in!" },
      { from: P_TYLER, mine: false, timestamp: now() - 60 * 26, text: 'What time does it start?' },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 20, read: true, text: "Let's meet at the bar around 6?" },
      { from: P_NATE,  mine: false, timestamp: now() - 60 * 15, text: 'Sounds good' },
    ]);
  }

  // ── Group: Family ──────────────────────────────────────────────
  if (contact.alias === 'Family') {
    return list('family', [
      { from: P_MOM, mine: false, timestamp: now() - 60 * 60 * 36, text: 'remember grandma birthday on sunday' },
      { from: P_DAD, mine: false, timestamp: now() - 60 * 60 * 36, text: 'noted 🎂' },
      { from: P_SIS, mine: false, timestamp: now() - 60 * 60 * 35, text: 'who is bringing the cake?' },
      { from: P_MOM, mine: false, timestamp: now() - 60 * 60 * 35, text: "I'll get it from the bakery" },
      { from: MINE,  mine: true,  timestamp: now() - 60 * 60 * 34, read: true, text: 'I can pick up flowers' },
      { from: P_SIS, mine: false, timestamp: now() - 60 * 60 * 34, text: 'perfect' },
      { from: P_DAD, mine: false, timestamp: now() - 60 * 60 * 8, text: 'forecast is rain sunday — backup plan?' },
      { from: P_MOM, mine: false, timestamp: now() - 60 * 60 * 8, text: "we'll move indoors, the living room works" },
      { from: P_SIS, mine: false, timestamp: now() - 60 * 60 * 7, text: 'works!' },
    ]);
  }

  // ── Group: Work eng (unread=7) ─────────────────────────────────
  if (contact.alias === 'Work eng') {
    return list('work', [
      { from: P_LEAD, mine: false, timestamp: now() - 60 * 60 * 16, text: 'standup at 10 moved to 11 today btw' },
      { from: P_PM,   mine: false, timestamp: now() - 60 * 60 * 16, text: 'thanks!' },
      { from: P_QA,   mine: false, timestamp: now() - 60 * 60 * 15, text: "the staging deploy broke again 🙃" },
      { from: P_LEAD, mine: false, timestamp: now() - 60 * 60 * 15, text: "ugh, looking" },
      { from: P_LEAD, mine: false, timestamp: now() - 60 * 60 * 14, text: 'fixed — migration was stuck' },
      { from: MINE,   mine: true,  timestamp: now() - 60 * 60 * 13, read: true, text: 'Worked for me now 👍' },
      { from: P_PM,   mine: false, timestamp: now() - 60 * 60 * 5, text: 'reminder: demo tomorrow, slides by eod' },
      { from: P_LEAD, mine: false, timestamp: now() - 60 * 60 * 4, text: 'Ill handle the technical half' },
      { from: P_DESIGN,mine: false,timestamp: now() - 60 * 60 * 4, text: 'just posted the v2 mocks in figma' },
      { from: P_PM,   mine: false, timestamp: now() - 60 * 60 * 3, text: 'chatting with sales — 3 new trials this week' },
      { from: P_QA,   mine: false, timestamp: now() - 60 * 60 * 2, text: 'flaky test on CI — investigating' },
      { from: P_LEAD, mine: false, timestamp: now() - 60 * 30, text: 'okay seems like CI is green now' },
      { from: P_LEAD, mine: false, timestamp: now() - 60 * 28, text: 'retry passed' },
      { from: P_PM,   mine: false, timestamp: now() - 60 * 20, text: "we're good for release" },
    ]);
  }

  // ── Group: Book club ───────────────────────────────────────────
  if (contact.alias === 'Book club') {
    return list('book', [
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 96, text: 'next month: "Project Hail Mary"?' },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 95, read: true, text: '👍' },
      { from: P_SIS,   mine: false, timestamp: now() - 60 * 60 * 94, text: 'yes please' },
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 60 * 48, text: 'halfway through — so good' },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 48, text: 'love the linguistics angle' },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 30, read: true, text: "rocky is my favourite character in years" },
      { from: P_SIS,   mine: false, timestamp: now() - 60 * 60 * 28, text: 'agreed' },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 24, text: "let's meet sunday 4pm?" },
    ]);
  }

  // ── Group: Tuesday D&D 🎲 ──────────────────────────────────────
  if (contact.alias === 'Tuesday D&D 🎲') {
    return list('dnd', [
      { from: P_LEAD,  mine: false, timestamp: now() - 60 * 60 * 72, text: 'Session 14 recap up on the wiki' },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 72, text: '🙏' },
      { from: P_TYRA,  mine: false, timestamp: now() - 60 * 60 * 50, text: 'can we start 30min late next tuesday? commute issue' },
      { from: P_LEAD,  mine: false, timestamp: now() - 60 * 60 * 50, text: 'sure' },
      { from: MINE,    mine: true,  timestamp: now() - 60 * 60 * 49, read: true, text: 'works for me' },
      { from: P_LEAD,  mine: false, timestamp: now() - 60 * 60 * 32, text: 'we pick up where we left — in the dragons cave' },
      { from: P_ANNA,  mine: false, timestamp: now() - 60 * 60 * 32, text: 'excited 🐉' },
    ]);
  }

  // ── Channel: dchain_updates ────────────────────────────────────
  if (contact.username === 'dchain_updates') {
    return list('dchain_updates', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 96, text: '🔨 v0.0.1-alpha tagged on Gitea' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 72, text: 'PBFT equivocation-detection тесты зелёные' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 60, text: 'New: /api/peers теперь включает peer-version info' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 48, text: '📘 Docs overhaul merged: docs/README.md' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 36, text: 'Schema migration scaffold landed (no-op для текущей версии)' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20, text: '🚀 v0.0.1 released' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20 + 10, text: 'Includes: auto-update from Gitea, peer-version gossip, schema migrations' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20 + 20, text: 'Check /api/well-known-version for the full feature list' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 12, text: 'Thanks to all testers — feedback drives the roadmap 🙏' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 3, text: 'v0.0.2 roadmap published: https://git.vsecoder.vodka/vsecoder/dchain' },
      { from: peer, mine: false, timestamp: now() - 60 * 30, text: 'quick heads-up: nightly builds switching to new docker-slim base' },
    ]);
  }

  // ── Channel: Relay broadcasts ──────────────────────────────────
  if (contact.alias === '⚡ Relay broadcasts') {
    return list('relay_bc', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 48, text: 'Relay fleet snapshot: 12 active, 3 inactive' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 40, text: 'Relay #3 came online in US-east' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 30, text: 'Validator set updated: 3→4' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20, text: 'PBFT view-change детектирован и отработан на блоке 184120' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 15, text: 'Mailbox eviction ran — 42 stale envelopes' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 5, text: 'Relay #8 slashed for equivocation — evidence at block 184202' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 2, text: 'Relay #12 came online in EU-west, registering now…' },
    ]);
  }

  // ── Channel: Tech news ────────────────────────────────────────
  if (contact.alias === '📰 Tech news') {
    return list('tech_news', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 120, text: 'Rust 1.78 released — new lints for raw pointers' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 100, text: 'Go 1.23 ships range-over-func officially' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 80, text: 'Expo SDK 54 drops — new-architecture default' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 60, text: 'CVE-2026-1337 patched in libsodium (update your keys)' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 40, text: 'Matrix protocol adds post-quantum handshakes' },
      {
        from: peer, mine: false, timestamp: now() - 60 * 60 * 30, text: 'Data-center aerial view — new hyperscaler in Iceland',
        attachment: {
          kind: 'image',
          uri:  'https://images.unsplash.com/photo-1558494949-ef010cbdcc31?w=800',
          width: 800, height: 533, mime: 'image/jpeg',
        },
      },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20, text: 'IETF draft: "DNS-over-blockchain"' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 6, text: 'GitHub tightens 2FA defaults for orgs' },
    ]);
  }

  // ── Channel: Design inspo (unread=12) ──────────────────────────
  if (contact.alias === '🎨 Design inspo') {
    return list('design_inspo', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 160, text: 'Weekly pick: Linear UI v3 breakdown' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 140, text: 'Figma file of the week: "Command bar patterns"' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 120, text: 'Motion study: Stripe checkout shake-error animation' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 100, text: "10 great empty-state illustrations (blogpost)" },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 80, text: 'Tool: Hatch — colour-palette extractor from photos' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 60, text: '🔮 Trend watch: glassmorphism is back (again)' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 40, text: 'Twitter thread: why rounded buttons are the default' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 20, text: 'Framer templates — black friday sale' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 3, text: 'New typeface: "Grotesk Pro" — free for personal use' },
    ]);
  }

  // ── Channel: NBA scores ────────────────────────────────────────
  if (contact.alias === '🏀 NBA scores') {
    return list('nba', [
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 160, text: 'Lakers 112 — Warriors 108 (OT)' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 130, text: 'Celtics 128 — Heat 115' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 100, text: 'Nuggets 119 — Thunder 102' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 70, text: "Knicks 101 — Bulls 98" },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 48, text: 'Mavericks 130 — Kings 127' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 24, text: 'Bucks 114 — Sixers 110' },
      { from: peer, mine: false, timestamp: now() - 60 * 60 * 4, text: 'Live: Lakers leading 78-72 at half' },
    ]);
  }

  return [];
}

// ─── Hook ──────────────────────────────────────────────────────────

export function useDevSeed() {
  const contacts    = useStore(s => s.contacts);
  const setContacts = useStore(s => s.setContacts);
  const setMessages = useStore(s => s.setMessages);

  useEffect(() => {
    if (contacts.length > 0) return;
    setContacts(mockContacts);
    for (const c of mockContacts) {
      const msgs = mockMessagesFor(c);
      if (msgs.length > 0) setMessages(c.address, msgs);
    }
  }, [contacts.length, setContacts, setMessages]);
}